Touch recognition method and touch panel thereof

• US 9,189,119 B2
• Filed: 09/15/2014
• Issued: 11/17/2015
• Est. Priority Date: 09/13/2013
• Status: Active Grant

• Current Assignee: Apex Material Technology Corp., Imagination Broadway Ltd.
• Original Assignee: Apex Material Technology Corp., Imagination Broadway Ltd.
• Inventors: Liao, Zong-Bin, Su, Hong-Lun, Qiu, Zhong-peng
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): Hegarty, Kelly B
• Application Number:
  US14/486,039
• Publication Number:
  US 20150077388A1
• Time in Patent Office: 428 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

A method for identifying a contact with a touch panel includes: performing a first measuring process for obtaining a baseline signal; performing a second measuring process for obtaining a contact signal if there are any contacts or approaches of the touch panel with objects; comparing the values of the baseline signal with the contact signal for generating the contact signal with a location information; performing a third measuring process for installing an exclusion area according to the baseline signal; determining whether the location information is in the exclusion area; and, discarding the location information if the location information is in the exclusion area.

Claims

1. A touch recognition method for a touch panel, the touch panel including a plurality of driving electrodes and a plurality of sensing electrodes, the method comprising:

initializing the driving electrodes and the sensing electrodes, including setting the driving electrodes and the sensing electrodes to a state of Low electric potential;

charging the driving electrodes to a state of High electric potential;

switching the sensing electrodes to a floating state, during which the sensing electrodes are charged for a short period with an integrated circuit including an analog-to-digital converter;

stopping the charging of the sensing electrodes, and switching the driving electrodes from the state of High electric potential to the state of Low electric potential, while the sensor electrodes are kept in the floating state; and

generating a plurality of sensing signals on the sensing electrodes sequentially measured by the analog-to-digital converter.

2. The method according to claim 1, wherein the sensing signal is defined as a baseline signal if there is no contact or approach on the surface of the touch panel with any object, and the sensing signal is defined as a contact signal if there is any contact or approach on the surface of the touch panel with any object.

3. The method according to claim 2, further comprising:

comparing the values of the sensing signals with the value of the baseline signal; and

outputting a positive signal if the value of the sensing signal is higher than or equal to the value of the baseline signal.

4. The method according to claim 3, further comprising:

comparing the value of the positive signal with a first threshold value higher than the value of the baseline signal; and

outputting the contact signal with a location information if the value of the positive signal is higher than or equal to the first threshold value.

5. The method according to claim 2, further comprising:

comparing the values of the sensing signals with the value of the baseline signal;

outputting a negative signal if the value of the sensing signal is lower than the value of the baseline signal, the negative signal including a location information; and

defining the location information as (X,Y) and installing an exclusion area as (X±

p, Y±

q), wherein the p and the q are natural numbers.

6. The method according to claim 5, further comprising:

comparing the value of the negative signal with a second threshold value lower than the value of the baseline signal;

outputting an exceptional signal if the value of the negative signal is lower than the second threshold value;

installing the exclusion area according to the exceptional signal; and

,

discarding a new location information if the new location information is in the exclusion area.

7. The method according to claim 5, further comprising:

comparing the value of the negative signal with a second threshold value lower than the value of the baseline signal;

outputting an restoring signal if the value of the negative signal is higher than the second threshold value; and

uninstalling the exclusion area according to the restoring signal.

8. A touch panel, including a plurality of driving electrodes and a plurality of sensing electrodes, the touch panel comprising:

a plurality of driving circuits, each of the driving circuits being electrically connected to a corresponding driving electrode;

an integrated circuit, including an analog-to-digital converter and being electrically connected to the sensing electrodes; and

a processing module, being electrically coupled to the driving circuits and the integrated circuit,

wherein the processing module delivers a driving signal to the driving circuits for charging the driving electrodes to a state of High electric potential when the sensing electrodes are in a state of Low electric potential;

the processing module switches the sensor electrodes to a floating state from the state of Low electric potential during which the sensing electrodes are charged for a short period with the integrated circuit;

the integrated circuit stops the charging of the sensing electrodes, and the processing module switches the driving electrodes from the state of High electric potential to the state of Low electric potential; and

a plurality of sensing signals are generated on the sensing electrodes, which are sequentially measured by the analog-to-digital converter.

9. The touch panel according to claim 8, wherein the sensing signal is defined as a baseline signal if there is no contact or approach on the surface of the touch panel with any object, and the sensing signal is defined as a contact signal if there is any contact or approach on the surface of the touch panel with any object.

10. The touch panel according to claim 9, further comprising a comparator, the comparator compares the values of the sensing signals with the value of the baseline signal, and a positive signal is outputted if the value of the sensing signal is higher than or equal to the value of the baseline signal.

11. The touch panel according to claim 10, wherein the comparator compares the value of the positive signal with a first threshold value higher than the value of the baseline signal, and the contact signal with a location information is outputted if the value of the positive signal is higher than or equal to the first threshold value.

12. The touch panel according to claim 9, further comprising a comparator, the comparator compares the values of the sensing signals with the value of the baseline signal, and a negative signal including a location information is outputted if the value of the sensing signal is lower than the value of the baseline signal.

13. The touch panel according to claim 12, wherein the comparator compares the value of the negative signal with a second threshold value lower than the value of the baseline signal, and an exceptional signal is outputted if the value of the negative signal is lower than the second threshold value.

14. The touch panel according to claim 12, wherein the comparator compares the value of the negative signal with a second threshold value lower than the value of the baseline signal, and an restoring signal is outputted if the value of the negative signal is higher than the second threshold value.

15. The touch panel according to claim 12, wherein the location information is defined as (X,Y) and an exclusion area is installed as (X±

p, Y±

q), which the p and the q are natural numbers.

16. The touch panel according to claim 15, wherein the comparator compares the value of the negative signal with a second threshold value lower than the value of the baseline signal, and an exceptional signal is outputted if the value of the negative signal is lower than the second threshold value.

17. The touch panel according to claim 15, wherein the comparator compares the value of the negative signal with a second threshold value lower than the value of the baseline signal, and an restoring signal is outputted if the value of the negative signal is higher than the second threshold value.

18. A touch recognition method for a touch panel, the touch panel including a plurality of driving electrodes and a plurality of sensing electrodes, the method comprising:

performing a first measuring process for obtaining a baseline signal;

performing a second measuring process for obtaining a contact signal if there is any contact or approach of the touch panel with any object;

comparing the values of the baseline signal with the contact signal for generating the contact signal with a location information;

performing a third measuring process for installing an exclusion area according to the baseline signal;

determining whether the location information is in the exclusion area; and

,

discarding the location information if the location information is in the exclusion area.

19. The method according to claim 18, wherein the third measuring process further comprising:

generating a restoring signal according to the baseline signal and the contact signal with the location information;

uninstalling the exclusion area according to the restoring signal; and

,

transmitting the contact signal with the location information to a register.